Gravity-lock.



J. GARLSTBDT.

GRAVITY LOCK. APPLICATION FILED 11211.15, 1911.

2 SHEETS-S HEBT 1.

1,028,860, Patented June 11,1912.

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COLUMBIA PLANoaRAPl-l Co.,wAsHlNuToN D c J. H. CARLSTBDT.

GRAVITY LOCK.

f APPLICATION FILED APB.15, 1911. l 1 ,028,860. .Patented June 1,1,1912.

ZIJ/Illness es cDLUMBlA PLANDGRAPH Co., WASHINGTON. D. c.

` Sweden,

JOI-IAN HJ'ALIVIAR CARLSTEDT, 0F GEFLE, SWEDEN.

GRAVITY-LOCK.

Speccaton of Letters Patent.

Patented June 11, 1912.

Application iiled April 15, 1911. Serial No. 621,397.

To all whom t may concern.'

Be it known that I, JOHAN I-IJALMAR CARLSTEDT, a subject of the King ofSweden, residing at Gefle, in the Kingdom of have invented new anduseful Improvements in GravityLocks, of which the following is aspecification, reference being had to the drawings accompanying andforming a parthereof.

This invention relates to improvements in springless or gravity locksfor doors and the like.

The object of the invention is to provide, a lock of this characterwhich has only a small number of parts of a simple form and which istherefore comparatively easy and inexpensive to manufacture and in whichthe parts may be made of such dimensions as to be strong without thelock as a whole being bulky.

The invention consists, chiefly, in this that the lock casing is movableup and down and acts by its own weight and the weight of. the partsinclosed in the same directly on the latch bolt or a bolt-actuatingmember or members connected thereto 'in such a manner as to cause thesaid bolt to advance by the descending movement of the casing.

The invention further comprises the con struction and combination ofparts herein after set forth.

In the drawing, I have shown by way of example a door lock embodying theinvention.

Figure 1 is a side view of the lock with the face of cover plate partlybroken away to show the operating parts, said parts being shown in theiradvanced or locking position which they normally take up, whether thedoor be open or closed, except at such times as they are retracted bythe manipulation of the vdoor knob or handle. Fig. 2 is a similar viewof the lock with the parts in retracted positions. Fig. 3 is a verticalcross-section of the lock.' Fig. 4 is a hori- Zontal section of thesame. Fig. 5 is a front view of the latch bolt, and Fig. 6 is a frontview of the striker plate with the hole for the said-latch bolt.

Referring to the drawing, 1 is the lock casing set in a recess in theedge of the door. The said recess is somewhat higher than the casing soas to allow the latter to move vertically therein. The casing is Guidedin its movement by two or more verlt-ical bars 2 or the likeengaging-corresponding grooves in the outer sides of the side walls ofthe casing and bearing with their outer sides on the walls of the recessin the edge of the door. The width of the casing is somewhat less thanthat ofthe recess, t'. c. the bars 2 project somewhat outside the `sidesof the casing, as shown in Fig. 3, by

which the casing is held in proper position out of contact with thewalls of the recess and guided during its vertical movement.

Journaled in the lower part of the rods 2, below the casing 1, is thespindle or shank 3 of the door knob or handle. Attached to the saidspindle, which is preferably rectangular in shape, is a lift arm 4. Thisarm normally takes up the horizontal position shown in Fig. 1 and servesto' support and raise the casing and to be actuated by the same for theadvancement of the latch bolt. Attached to the spindle 3, at rightangles to the arm 4, is a second arm 5 entering a recess or opening inthe rear part of the latch bolt 6 and serving as a boltactuating member.The shank of the bolt 6 is guided at itssides by one side wall of thecasing and the arm 5 and at its lower side'by a plate 7 or the like. Theupper half of the head of the bolt is obliquely cut, as shown in Figs. 4and 5 so as to cause the said bolt to slide inward by the lateralpressure thereon eX- erted by the door jamb or striker plate, when 4thedoor is `forcibly swung into closing position. In order to prevent thebolt from sliding inward so as to unlock the door when the latter isexposed to pressure, the lower half of the head of the bolt is partlycut away, as shown in Figs. 2 and 5 leaving a comparatively thin plateof uniform thickness adapted to enter a corresponding downward extensionof the bolt opening in the striker plate 8 (Fig. 6). The opening in the'said plate must obviously be suiiiciently high to allow the bolt head tomove vertically therein when the door is locked or unlocked.

Placed above the latch bolt 6 is a locking dog or tumbler 9 adapted toswing about a pivot pin 10 and to drop into a notch 11 in the bolt 6when the latter is moved suiii.

ciently toward the right' from the position shown in Fig. l.

The described lock works as follows: When the lock is to be* opened, theshank or spindle 3 is turned in a direction causing the arm 4 to'swingupward and the arm 5 to swing laterally from the position shown no i inFig. 1 into the position shown in Fig. 2. In so doing, the casing l israised by the arm 4, and the bolt 6 is moved inward by the arm 6. If thelock is thereupon released, the casing l and the bolt 6 actby gravity topress the arm 4 downward, thereby turning the spindle 3 and causing thearm 5 to advance the bolt 6. If the door handle is operated so as toturn the arms l and 5 from the position shown7 in Fig. l toward theright e. in the clockward direct-ion), the bolt 6 is advanced fartherinto the recess in the door j amb so as to allow the tumbler 9 to dropby gravity into the notch ll in the latch bolt, thereby securing thelatter in its advanced position so that it cannot be retracted, withoutthe tumbler being first raised by a suitable key. The bolt 6 thus servesas a combined latch and locking bolt by which the door may be secured inits closed position.

I claim:

l. In a gravity lock, the combination of a vertically movable casing, asliding bolt mounted in the said casing, and connections between thesaid casing and the said sliding bolt causing the latter to be advancedby the descending movement of the casing.

' 2. In a lock, the combination of a vertically movable casing, asliding bolt mounted in the said casing, a spindle, bolt-actuating meansattached to the said spindle, said means comprising two armsone of whichserves as a lift arm for the casing, while the other engages the slidingbolt, causing the same to be advanced by the descending movement of thecasing.

3. In a lock, the combination of a verti` cally movable casing, guidebars engaging corresponding grooves in the said casing, and a slidingbolt mounted in the said casing in such a manner as to be advanced bythe descending movement of the same.

4. In a lock, the combination of a vertically movable casing, guide barsengaging Acorresponding grooves in the said casing, a sliding boltmounted in the said casing, and

' connections between the said casing and the said sliding bolt causingthe latterto be advanced by the descending movement of the casing.

5. In a lock, the combination of a vertically movable casing, a slidingbolt comprising a shank and a head mounted in the said casing in such amanner as to be advanced by the descending movement thereof, and astriker plate having an opening for the head of the said bolt, said bolthaving the upper part of the head obliquely cut at the end and the lowerpart thereof partly cutaway, leaving a comparatively thin plate ofuniform thickness adapted to enter a corresponding downward extension ofthe opening inthe striker plate.

6. In a lock, the combination of a vertically movable casing, a slidingbolt comprising a shank and a head mounted in the said casing,connections between the said casing and the said sliding bolt causingthe latter to be advanced by the descending movement of the casing, anda striker plate having an opening for the head of the said bolt, saidbolt having the upper part of the head obliquely cut at theend and thelower part thereof partly cut away, leaving a comparatively thin plateof uniform thickness adapted to enter a corresponding downward extensionof the opening in the striker plate.

7 In a gravity lock, the combination of a vertically movable casing, asliding bolt mounted in the said casing, connections between the saidcasing andthe said sliding l bolt .causing the latter to be advanced bythe descending movement of the casing, and a tumbler for securing thebolt in protracted position when the latter is further advanced.

JOHAN HJALMAR CARLSTEDT. Witnesses:

L. LUNDGREN, ELLA BILILD.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C. Y

